The normal arch hook into the 8250 serial world is via passingin a plat_serial8250_port struct. However, this struct doesnot have a bugs field, so there is no way to have the archcode pass in info about known uart issues.

Add a bug field to the plat_serial8250_port struct, so that thearch can pass in this information. Also don't do a blanketoverwrite of the bugs setting in the 8250.c driver. Finally,relocate the known bug #define list to a globally visible headerso that the arch can assign any appropriate values from the list.